Other Parts Discussed in Thread: SN65DSI86, , HD3SS214, TPS61196
I am a research student from Hong Kong, I have designed a embedded board to connect my display card to eDP panel cause of my limited budget so i decide to assembly my own display screen base on Ti chips.
besides is my system layout:
My prototype supports HDMI and DP input as the schematic show above, HDMI flow is input to Toshiba TC358870XBG (HDMI to MIPI) then input to Ti SN65DSI86 (MIPI to eDP) then input to channel A of Ti HD3SS214. DP input is connect to channel B of Ti HD3SS214, finally the switched DP signal is connected to TDP142 cause i want to snoop the power state of GPU video signal and use a STM32 to control the panel back light. I have finish my two prototypes, at the beginning, the display work perfectly. The pictures shown below is my display prototype:
My problem is that one of my display can't boot up properly base on the same program flash into the stm32 as two picture shown below
the display which can't work properly, As you can see the left side area is dark it seems that one of the DP lane signal is weak?
the display work and boot up properly
the backlight LED of two panel is in good condition cause the Ti TPS61196 LED driver can't work if the LED string is in bad conditions, So I am wandering which case can make the display can't work perfectly, I am not the specialist of DP or other video signal embedded design so can anyone help me to solve this problem.
Note: both of the panels is in good condition.
backlight is also good
Thank you very much